Malicious PDF — malware analysis report

Static analysis result for SHA-256 711498701cb7c79b…

MALICIOUS

PDF

81.9 KB Created: 2021-01-18 19:54:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: e14dce2ba47abf82a83ecea6f5479ff9 SHA-1: 23256534f9034e6e2584b106adb84a9d16d3ab21 SHA-256: 711498701cb7c79b9b5ccf03f4c611772910aba47b71719e4fba0800ed31c749
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malware or lead to phishing sites. The presence of a 'download button' heuristic and a ClamAV detection for 'Pdf.Phishing.Trojan' further supports a malicious intent. The document body, though obfuscated, contains a lure related to a game cheat APK, indicating a social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://baarspo.ru/123?utm_term=one+piece+treasure+cruise+rainbow+gems+cheat+apk PDF link annotation
    • https://site-1230430.mozfiles.com/files/1230430/12594019884.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368488/normal_5f88cfff652f3.pdfIn PDF document text
    • https://zajilonuxiwez.weebly.com/uploads/1/3/4/8/134871265/bixap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380545/normal_5f9f1dc8c1bb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480897/normal_5fac5dbf19eb4.pdfIn PDF document text
    • https://site-1176181.mozfiles.com/files/1176181/90277243759.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366398/normal_5f87b48371674.pdfIn PDF document text
    • https://sewemojokevapu.weebly.com/uploads/1/3/4/4/134463988/sisaragox.pdfIn PDF document text
    • https://site-1206032.mozfiles.com/files/1206032/47639428580.pdfIn PDF document text
    • https://site-1176903.mozfiles.com/files/1176903/detention_lyrics_clean.pdfIn PDF document text
    • https://momiweporav.weebly.com/uploads/1/3/4/7/134745900/b482cc00ef.pdfIn PDF document text
    • https://wivupenoremew.weebly.com/uploads/1/3/0/7/130775018/481069.pdfIn PDF document text
    • https://zajilonuxiwez.weebly.com/uploads/1/3/4/8/134871265/fe4b4b07.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.indictrans.orgIn PDF document text
    • https://s3.amazonaws.com/mujevubutukoxu/78693188991.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/antivirus_per_android_gratis_senza_pubblicit.pdfIn PDF document text
    • https://s3.amazonaws.com/zewimu/30232236414.pdfIn PDF document text
    • https://s3.amazonaws.com/baritexovopa/futbol_1_ukraine_tv_guide.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D6 5636 bytes
SHA-256: 3e2ced4235d0d224bda6eff049d9bdcb4bb4c89f9cbbeb6c57c908e0063e23d8
font_01_sfnt_off000108df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DF 3736 bytes
SHA-256: 3aae7232c2799c857c22d7687d3e61a18f5dabd768a739ff3f10561a7389c3c5
font_02_sfnt_off00011441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11441 11032 bytes
SHA-256: 4db376ef313ff31f7e13f458a62b6a24f95a6ee034c5d8c7714abde26d00fe80